Add IntersectionObserverEntry.intersectionRatio attribute.

third_party/WebKit/Source/core/dom/IntersectionObserverEntry.cpp

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/dom/IntersectionObserverEntry.h"
 
 #include "core/dom/Element.h"
 
 namespace blink {
 
-IntersectionObserverEntry::IntersectionObserverEntry(DOMHighResTimeStamp time, const IntRect& boundingClientRect, const IntRect* rootBounds, const IntRect& intersectionRect, Element* target)
+IntersectionObserverEntry::IntersectionObserverEntry(DOMHighResTimeStamp time, double intersectionRatio, const IntRect& boundingClientRect, const IntRect* rootBounds, const IntRect& intersectionRect, Element* target)
     : m_time(time)
+    , m_intersectionRatio(intersectionRatio)
     , m_boundingClientRect(ClientRect::create(boundingClientRect))
     , m_rootBounds(rootBounds ? ClientRect::create(*rootBounds) : nullptr)
     , m_intersectionRect(ClientRect::create(intersectionRect))
     , m_target(target)
 
 {
 }
 
 IntersectionObserverEntry::~IntersectionObserverEntry()
 {
 }
 
 DEFINE_TRACE(IntersectionObserverEntry)
 {
     visitor->trace(m_boundingClientRect);
     visitor->trace(m_rootBounds);
     visitor->trace(m_intersectionRect);
     visitor->trace(m_target);
 }
 
 } // namespace blink